Communication tools (1)

Long ago, before phones, people found ways to send messages far away. They lit fires to make smoke signals, beat drums and sent riders. Some people used pigeons to carry small notes. In the 1800s the telegraph sent messages along wires as short and long clicks. The code for these clicks is called Morse code. A short signal is a dot and a long signal is a dash. Each number and letter has its own pattern of dots and dashes. We can send Morse with a torch or by tapping. A code can also give steps. A friend or a robot can follow commands such as forward and turn right. When the same step comes again and again, we use repeat to make the code shorter.